Apparatus for grooving rolls



March 28, `1950 P. R. MOSS v 2,502,268

APPARATUS FOR GROOVING ROLLS H l5 ATTORNEY P. R. MOSS APPARATUS FORGROOVING ROLLS March 28, 1950 3 Sheets-Sheet 2 Filed April 23, 1946INVENTORI P560/ M055,

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HIS ATTORNEY.

March 28, 1950 P. R. Moss 2,502,26

lAPPARATUS GROOVING ROLLS Filed April 25, 1946 s sheets-sheet sINVENTORI H15 ATTORN EY.

Patented Mar. 28, 1950 UNITED STATES PATENT OFFICE ABPARATUS FORGRoovING ROLLS `Percy R. Moss, Birmingham, Ala., assigner to TennesseeCoal, Iron and Railroad Company. a corporation of Alabama ApplicationApril 23, 1946, serial No. 664,293

(ci. sra- 14) 2 Claims. 1v

This invention relates Ito apparatus for groov- 'ing rolls and moreparticularly to a lathe attachment for putting a variable pitch spiralgroove in the exit rolls of galvanizing machines. The purpose of thegroove is to spread the spelter over the surfaces of the sheet beinggalvanized as it emerges from the galvanizing machine. The exit rollspreviously used were grooved with a constant pitch spiral extending thefull length of the roll. With this type of groove an uneven distributionof the spelter on the sheet surface was obtained, the spelter beingextra heavy on the edges of the sheets, thus causing flaking when thesheets were subsequently processed. This constant pitch spiral groovewas made by turning the roll on a conventional type lathe. I have foundthat by using a variable pitch spiral groove, a better spelterdistribution is obtained. It was impractical to produce this variablepitch spiral on a conventional lathe and, therefore, it was necessary todevise Ways and means for producing such a spiral.

It is an object of my invention to provide a lathe attachment forproducing a variable pitch spiral groove in rolls.

This and other objects will be more apparent after referring to thefollowing speciiication and attached drawings, in which:

Figure 1 is a plan view of a roll in place in the lathe of my invention;

Figure 2 is a front elevation of the lathe;

Figure 3 is a sectional view taken on the line III- IH of Figure 1; and

Figure 4 is a sectional view taken on the line IV-IV of Figure 1.

Referring more particularly to the drawings, the reference numeral 2indicates the headstock of a conventional lathe and the referencenumeral 4 indicates the tailstock which is mounted for movement towardthe headstock on the guides 6. The roll R to be grooved is rotatablymounted between the headstock 2 and the tailstock 4, the chuck 8 of theheadstock being rotated by the motor I0, to revolve the roll R. The leadscrew I2, having its axis parallel to the roll axis, is also driven fromthe motor I0. The lathe carriage I4 is mounted on the guides and ismoved therealong when engaged with the lead screw I 2. The foregoing isall in accordance with the usual practice. A tool rest I 6 whichsupportsfa grooving tool I1 is slidably mounted on the guides I8 of thecarriage I4 for movement parallel to the roll axis. The tool rest I6 maybe ofA conventional construction with its feed screwf removed to allowsliding motion with respect to the carriage I4. A fulcrum pin 20 ismounted on the carriage I4 on the side of the roll R opposite the toolrest I6. A'bell crank lever 22 is mounted for pivotal movement onanti-friction bearings 24 which are supported by the pin 2U as shown inFigure 4. A bracket 26 is attached to the tool rest I6 in any suitablemanner. The arm 28 of the bell crank lever 22 is provided with a slot 30at its outer end which is adjacent spaced apart lugs 32 in the bracket26. The arm 28 extends between the lugs 32 which have aligned openings34 therein. The pin 3E passes through the aligned openings 34 and theslot 30. A bracket 38 is fastened to the lathe on the side opposite thelead screw l2 by means of screws 40. Mounted on the bracket 38 is a cam42 having a cam groove 44 therein. The second arm 46 of the bell cranklever 22 has an opening 48 at its outer end for receiving a bolt 5l!which supports the cam follower 52 in the cam groove 44.

The operation of the device is as follows:

The roll R is placed in the lathe Vand the motor Ill started up torotate the roll. The carriage I4 is engaged with the lead screw I2, thiscausing the carriage to be moved parallel to the roll R. AS the carriagemoves, the tool I'I engages the roll R and cuts the groove 54 therein.The pitch of the groove is varied as follows:

As the carriage i4 advances, the cam follower 52 follows the cam track44 causing the bell crank lever 22 to swing about the pivot pin 20.'I'his causes the tool rest I5 to advance a predetermined amount on thecarriage I4 for each revolution of the roll up to the center of theroll. The cam track 44 is so shaped that when the tool I'I reaches thecenter of the roll, the movement of the carriage I4 and the tool rest I6are the same. After passing the center of the roll, the movement of thetool rest I6 is retarded by the cam action the same amount that it wasadvanced up to the center line of the roll. In other words, the pitch ofthe groove 54 gradually decreases in the same manner from each end ofthe roll to the center thereof. This attachment can also be used formaking auxiliary lead screws for lathes or for cutting cam grooves in arotary member.

While one embodiment of my invention has been shown and described, itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the following claims.

I claim:

1. In a machine for grooving the periphery of a roll or the like, thecombination including Ia bed,

means on said bed for rotatably mounting said roll, a carriage slidableon said bed, means for moving said carriage parallel to the axis of saidroll, a tool rest mounted on said carriage for movement with respectthereto parallel to the `axis 0f said roll, a tool mounted on said rest,-a bell crank piv-otally mounted on said carriage, a cam track mountedon said bed, means for connecting one Iarm of said crank to the toolrest, and a cam follower mounted on the other arm of said crank;

and engaging said cam track, said cam follower following said cam trackduring movement of said carriage to move said tool rest with respect tosaid carriage.

2. In a machine for grooving the periphery o a roll or the like, thecombination includinga bed, means on said bed for rotatably mountingsaid third named means and scanning said pattern, said follower scanningsaid pattern during movement of said carriage to move said tool restwith respect to said carriage.

PERCY R. MOSS.

REFERENCES CITED TheA following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,195,293 Townsend Aug. 22, 19161,230,647 Aurich June 19, 1917 1,374,378 Johnson Apr. 12, 19211,571,745- Warner Feb. 2, 1926 1,630,716v Pierce May 31, 1927 1,982,983Czemba Dec. 4, 1934 2,069,508 Rutemiller et al Feb. 2, 1937 2,354,372Groene et al July 25, 1944 2,407,778 Groene et al. Sept. 17, 1946FOREIGN PATENTS Number Country Date 4,000 GreatBritain 1874

